While you could run this artifact creature just to protect your commander, it gets better with every additional legend
Spoiler Main Deck: | Artifact Moralltach || Artifact Scythe ||| Artifact Failnaught || Artifact Vajra || Artifact Lancea || Artifact Caduceus | Artifact Achilleshield ||| Artifact Beagalltach | Artifact Aegis | Thunder King Rai-Oh || Aroma Jar ||| Dark Sanctuary ||| Card of Demise ||| Pot of Duality || Mystical Space Typhoon ||| Artifact Ignition ||| Artifact Sanctum ||| Call of the Haunted Extra Deck: || Gaia Dragon, the Thunder Charger || Constellar Ptolemy M7 | Number 21: Frozen Lady Justice | Wind-Up Arsenal Zenmaioh | Adreus, Keeper of Armageddon || Constellar Pleaides || Number 61: Volcasaurus || Artifact Durendal | Shark Fortress | Outer Entity Azaroth Conclusion: As always, the list above is just my personal build
C Common Valkyrian Knight X FIRE Level 4 [ WarriorEffect ] ATK 1900 DEF 1200 Monsters your opponent controls cannot target Warrior monsters for attacks, except "Valkyrian Knight"
This is especially useful for the buyback feature, where you can sell cards back to Packz based on their current market value
However, theres no harm in having at least 1 copy just in case
If you cannot, you take 3000 damage.[/spoiler] However, the Surrealist you Special Summoned cannot swap that turn